Air compressor



FIG. 1 is a right side elevational view of an air compressor showing an embodiment of my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is bottom plan view thereof; and,

FIG. 5 is a rear elevational view thereof. 

The ornamental design for an air compressor, as shown and described. 